ok so one of my friends just bought a used 2006 scion tc and realized that the stereo is not the same as the one in my 2007 so he bought a headunit from someone that came out of a 2007 and also bought the interface cable from trdsparks.com but the question is...what cable goes from the headunit to the center console where you hook the interface cable into?

 

it should plug right in, no two plugs r the same so you should have a problem...